Fall back to legacy add to homescreen behavior on non-GMS device or GMS isn't availabe.

chrome/android/java/src/org/chromium/chrome/browser/webapps/WebApkInstaller.java

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package org.chromium.chrome.browser.webapps;
 
 import android.content.Context;
 import android.content.Intent;
 import android.content.pm.PackageManager;
 import android.net.Uri;
 import android.os.Build;
 import android.os.Looper;
 
 import org.chromium.base.ApplicationState;
 import org.chromium.base.ApplicationStatus;
 import org.chromium.base.Callback;
 import org.chromium.base.ContentUriUtils;
 import org.chromium.base.ContextUtils;
 import org.chromium.base.annotations.CalledByNative;
 import org.chromium.chrome.browser.ChromeApplication;
 import org.chromium.chrome.browser.ShortcutHelper;
 import org.chromium.chrome.browser.banners.InstallerDelegate;
+import org.chromium.chrome.browser.externalauth.ExternalAuthUtils;
+import org.chromium.chrome.browser.externalauth.UserRecoverableErrorHandler;
 import org.chromium.chrome.browser.util.IntentUtils;
 
 import java.io.File;
 
 /**
  * Java counterpart to webapk_installer.h
  * Contains functionality to install / update WebAPKs.
  * This Java object is created by and owned by the native WebApkInstaller.
  */
 public class WebApkInstaller {
@@ skipping 22 matching lines @@
         ChromeApplication application = (ChromeApplication) ContextUtils.getApplicationContext();
         mGooglePlayWebApkInstallDelegate = application.getGooglePlayWebApkInstallDelegate();
     }
 
     @CalledByNative
     private static WebApkInstaller create(long nativePtr) {
         return new WebApkInstaller(nativePtr);
     }
 
     @CalledByNative
-    private boolean hasGooglePlayWebApkInstallDelegate() {
-        return mGooglePlayWebApkInstallDelegate != null;
+    private boolean canUseGooglePlayInstallService() {
+        return mGooglePlayWebApkInstallDelegate != null
+                && ExternalAuthUtils.getInstance().canUseGooglePlayServices(
+                        ContextUtils.getApplicationContext(),
+                        new UserRecoverableErrorHandler.Silent());
     }
 
     @CalledByNative
     private void destroy() {
         if (mListener != null) {
             ApplicationStatus.unregisterApplicationStateListener(mListener);
         }
         mListener = null;
         mNativePointer = 0;
     }
@@ skipping 151 matching lines @@
         };
     }
 
     private boolean isWebApkInstalled(String packageName) {
         PackageManager packageManager = ContextUtils.getApplicationContext().getPackageManager();
         return InstallerDelegate.isInstalled(packageManager, packageName);
     }
 
     private native void nativeOnInstallFinished(long nativeWebApkInstaller, boolean success);
 }